Definitions for radial tire
Random House Webster's College Dictionary
a tire in which the plies or cords run from one bead to the other at right angles to both beads.
radial, radial tire, radial-ply tire(noun)
pneumatic tire that has radial-ply casing
A style (or method of construction) of tires used for most vehicles, which incorporate reinforcing cords distributed radially relative to the hub (at 90 degrees to the direction of travel).